Lightroom has some features that I genuinely like, including a great noise reduction tool, gradient tool and lens profiles. None of those are reasons to switch, though. As I mentioned, I have Photoshop CS5. That comes with Adobe Camera Raw, which includes the same features in the Lightroom 3 Development module. There is no reason to believe that Adobe won’t update ACR to be comparable with Lightroom 4 at some point. Aside from that, I think that Aperture 3 has a better RAW conversion engine than Lightroom/ACR. However, the differences between the two get into the pixel-peeping range and it’s not a substantial advantage. Nobody is going to look at a finished photo and say, “Oh, dude! You used Lightroom’s RAW conversion instead of Aperture. You really blew it there!” Not gonna happen.